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1da177e4 LT |
1 | #ifndef _LINUX_VM86_H |
2 | #define _LINUX_VM86_H | |
3 | ||
4 | /* | |
5 | * I'm guessing at the VIF/VIP flag usage, but hope that this is how | |
6 | * the Pentium uses them. Linux will return from vm86 mode when both | |
7 | * VIF and VIP is set. | |
8 | * | |
9 | * On a Pentium, we could probably optimize the virtual flags directly | |
10 | * in the eflags register instead of doing it "by hand" in vflags... | |
11 | * | |
12 | * Linus | |
13 | */ | |
14 | ||
15 | #define TF_MASK 0x00000100 | |
16 | #define IF_MASK 0x00000200 | |
17 | #define IOPL_MASK 0x00003000 | |
18 | #define NT_MASK 0x00004000 | |
19 | #define VM_MASK 0x00020000 | |
20 | #define AC_MASK 0x00040000 | |
21 | #define VIF_MASK 0x00080000 /* virtual interrupt flag */ | |
22 | #define VIP_MASK 0x00100000 /* virtual interrupt pending */ | |
23 | #define ID_MASK 0x00200000 | |
24 | ||
25 | #define BIOSSEG 0x0f000 | |
26 | ||
27 | #define CPU_086 0 | |
28 | #define CPU_186 1 | |
29 | #define CPU_286 2 | |
30 | #define CPU_386 3 | |
31 | #define CPU_486 4 | |
32 | #define CPU_586 5 | |
33 | ||
34 | /* | |
35 | * Return values for the 'vm86()' system call | |
36 | */ | |
37 | #define VM86_TYPE(retval) ((retval) & 0xff) | |
38 | #define VM86_ARG(retval) ((retval) >> 8) | |
39 | ||
40 | #define VM86_SIGNAL 0 /* return due to signal */ | |
41 | #define VM86_UNKNOWN 1 /* unhandled GP fault - IO-instruction or similar */ | |
42 | #define VM86_INTx 2 /* int3/int x instruction (ARG = x) */ | |
43 | #define VM86_STI 3 /* sti/popf/iret instruction enabled virtual interrupts */ | |
44 | ||
45 | /* | |
46 | * Additional return values when invoking new vm86() | |
47 | */ | |
48 | #define VM86_PICRETURN 4 /* return due to pending PIC request */ | |
49 | #define VM86_TRAP 6 /* return due to DOS-debugger request */ | |
50 | ||
51 | /* | |
52 | * function codes when invoking new vm86() | |
53 | */ | |
54 | #define VM86_PLUS_INSTALL_CHECK 0 | |
55 | #define VM86_ENTER 1 | |
56 | #define VM86_ENTER_NO_BYPASS 2 | |
57 | #define VM86_REQUEST_IRQ 3 | |
58 | #define VM86_FREE_IRQ 4 | |
59 | #define VM86_GET_IRQ_BITS 5 | |
60 | #define VM86_GET_AND_RESET_IRQ 6 | |
61 | ||
62 | /* | |
63 | * This is the stack-layout seen by the user space program when we have | |
64 | * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout | |
65 | * is 'kernel_vm86_regs' (see below). | |
66 | */ | |
67 | ||
68 | struct vm86_regs { | |
69 | /* | |
70 | * normal regs, with special meaning for the segment descriptors.. | |
71 | */ | |
72 | long ebx; | |
73 | long ecx; | |
74 | long edx; | |
75 | long esi; | |
76 | long edi; | |
77 | long ebp; | |
78 | long eax; | |
79 | long __null_ds; | |
80 | long __null_es; | |
81 | long __null_fs; | |
82 | long __null_gs; | |
83 | long orig_eax; | |
84 | long eip; | |
85 | unsigned short cs, __csh; | |
86 | long eflags; | |
87 | long esp; | |
88 | unsigned short ss, __ssh; | |
89 | /* | |
90 | * these are specific to v86 mode: | |
91 | */ | |
92 | unsigned short es, __esh; | |
93 | unsigned short ds, __dsh; | |
94 | unsigned short fs, __fsh; | |
95 | unsigned short gs, __gsh; | |
96 | }; | |
97 | ||
98 | struct revectored_struct { | |
99 | unsigned long __map[8]; /* 256 bits */ | |
100 | }; | |
101 | ||
102 | struct vm86_struct { | |
103 | struct vm86_regs regs; | |
104 | unsigned long flags; | |
105 | unsigned long screen_bitmap; | |
106 | unsigned long cpu_type; | |
107 | struct revectored_struct int_revectored; | |
108 | struct revectored_struct int21_revectored; | |
109 | }; | |
110 | ||
111 | /* | |
112 | * flags masks | |
113 | */ | |
114 | #define VM86_SCREEN_BITMAP 0x0001 | |
115 | ||
116 | struct vm86plus_info_struct { | |
117 | unsigned long force_return_for_pic:1; | |
118 | unsigned long vm86dbg_active:1; /* for debugger */ | |
119 | unsigned long vm86dbg_TFpendig:1; /* for debugger */ | |
120 | unsigned long unused:28; | |
121 | unsigned long is_vm86pus:1; /* for vm86 internal use */ | |
122 | unsigned char vm86dbg_intxxtab[32]; /* for debugger */ | |
123 | }; | |
124 | ||
125 | struct vm86plus_struct { | |
126 | struct vm86_regs regs; | |
127 | unsigned long flags; | |
128 | unsigned long screen_bitmap; | |
129 | unsigned long cpu_type; | |
130 | struct revectored_struct int_revectored; | |
131 | struct revectored_struct int21_revectored; | |
132 | struct vm86plus_info_struct vm86plus; | |
133 | }; | |
134 | ||
135 | #ifdef __KERNEL__ | |
136 | /* | |
137 | * This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86 | |
138 | * mode - the main change is that the old segment descriptors aren't | |
139 | * useful any more and are forced to be zero by the kernel (and the | |
140 | * hardware when a trap occurs), and the real segment descriptors are | |
141 | * at the end of the structure. Look at ptrace.h to see the "normal" | |
142 | * setup. For user space layout see 'struct vm86_regs' above. | |
143 | */ | |
144 | ||
145 | struct kernel_vm86_regs { | |
146 | /* | |
147 | * normal regs, with special meaning for the segment descriptors.. | |
148 | */ | |
149 | long ebx; | |
150 | long ecx; | |
151 | long edx; | |
152 | long esi; | |
153 | long edi; | |
154 | long ebp; | |
155 | long eax; | |
156 | long __null_ds; | |
157 | long __null_es; | |
158 | long orig_eax; | |
159 | long eip; | |
160 | unsigned short cs, __csh; | |
161 | long eflags; | |
162 | long esp; | |
163 | unsigned short ss, __ssh; | |
164 | /* | |
165 | * these are specific to v86 mode: | |
166 | */ | |
167 | unsigned short es, __esh; | |
168 | unsigned short ds, __dsh; | |
169 | unsigned short fs, __fsh; | |
170 | unsigned short gs, __gsh; | |
171 | }; | |
172 | ||
173 | struct kernel_vm86_struct { | |
174 | struct kernel_vm86_regs regs; | |
175 | /* | |
176 | * the below part remains on the kernel stack while we are in VM86 mode. | |
177 | * 'tss.esp0' then contains the address of VM86_TSS_ESP0 below, and when we | |
178 | * get forced back from VM86, the CPU and "SAVE_ALL" will restore the above | |
179 | * 'struct kernel_vm86_regs' with the then actual values. | |
180 | * Therefore, pt_regs in fact points to a complete 'kernel_vm86_struct' | |
181 | * in kernelspace, hence we need not reget the data from userspace. | |
182 | */ | |
183 | #define VM86_TSS_ESP0 flags | |
184 | unsigned long flags; | |
185 | unsigned long screen_bitmap; | |
186 | unsigned long cpu_type; | |
187 | struct revectored_struct int_revectored; | |
188 | struct revectored_struct int21_revectored; | |
189 | struct vm86plus_info_struct vm86plus; | |
190 | struct pt_regs *regs32; /* here we save the pointer to the old regs */ | |
191 | /* | |
192 | * The below is not part of the structure, but the stack layout continues | |
193 | * this way. In front of 'return-eip' may be some data, depending on | |
194 | * compilation, so we don't rely on this and save the pointer to 'oldregs' | |
195 | * in 'regs32' above. | |
196 | * However, with GCC-2.7.2 and the current CFLAGS you see exactly this: | |
197 | ||
198 | long return-eip; from call to vm86() | |
199 | struct pt_regs oldregs; user space registers as saved by syscall | |
200 | */ | |
201 | }; | |
202 | ||
203 | void handle_vm86_fault(struct kernel_vm86_regs *, long); | |
204 | int handle_vm86_trap(struct kernel_vm86_regs *, long, int); | |
205 | ||
206 | #endif /* __KERNEL__ */ | |
207 | ||
208 | #endif |